部分传输序列(Partial Transmit Sequence,PTS)是降低正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均比(Peak-to-Average Power Ratio,PAPR)的有效方法,但是PTS穷举法搜索最优解,使系统复杂度增加。针对这一...部分传输序列(Partial Transmit Sequence,PTS)是降低正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均比(Peak-to-Average Power Ratio,PAPR)的有效方法,但是PTS穷举法搜索最优解,使系统复杂度增加。针对这一缺点进行改进,提出了基于离散粒子群优化的部分传输序列(Partial Transmit Sequence based on Discrete Particle Swarm Optimization,PTS-DPSO)方法,并将其应用到基于偏移正交幅度调制的滤波器组多载波系统(Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation,FBMC/OQAM)中。PTS-DPSO利用离散粒子群优化搜寻最优解,避免了系统复杂度的增加。通过仿真验证,PTS-DPSO可以有效抑制FBMC/OQAM系统过高的PAPR且误码率低。展开更多
Compared to OFDM systems with cyclic prefi x, fi lterbank multicarrier with offset quadrature amplitude modulation(FBMC/OQAM) system is considered as an alternative technology for next generation wireless communicatio...Compared to OFDM systems with cyclic prefi x, fi lterbank multicarrier with offset quadrature amplitude modulation(FBMC/OQAM) system is considered as an alternative technology for next generation wireless communication systems. However, FBMC systems suffer from intrinsic imaginary interference caused by the real-fi eld orthogonality destruction when passing through complex-valued fading channels. By analyzing the transmultiplexer's response of FBMC/OQAM systems, in this paper, a simple conjugated transmission scheme is proposed for FBMC/OQAM systems. Following the specific conjugation design, the intrinsic imaginary interference including the intrinsic inter-symbol and the inter-carrier interference can be eliminated at the receiver side through linear signal processing operation. Meanwhile, the proposed conjugated transmission scheme is able to obtain extra linear combination diversity gains for improving the systematic performance of FBMC/OQAM. Simulation results show that the proposed scheme is more efficient than conventional methods, especially in practical application scenarios with large Doppler spread caused by high-speed movement.展开更多
Filter-bank multicarrier （FBMC） with offset quadrature amplitude modulation （OQAM） is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing ...Filter-bank multicarrier （FBMC） with offset quadrature amplitude modulation （OQAM） is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing （OFDM） systems. However, because of or-thogonality in real field and the presence of imaginary intrinsic interference, channel estimation in FBMC is not as straightforward as OFDM systems especially in multiple antenna scenarios. In this paper, we propose a channel estimation method which employs intrinsic interference cancellation at the transmitter side. The simulation results show that this method has less pilot overhead, less peak to average power ratio （PAPR）, better bit error rate （BER）, and better mean square error （MSE） performance compared to the well-known intrinsic approximation methods （IAM）.展开更多
为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进...为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进行改进并引入到FBMC系统中。利用共轭对称结构能够提高定时精度和加权处理能够更好地抵抗频偏影响的特点设计同步序列,进行共轭对称和加权处理。仿真结果表明,基于改进序列的Park算法相较共轭对称序列的TR1算法,其信噪比提前3 dB达到了100%定时准确率,实现了低信噪比下的高精度定时同步,且具有更强的抗频偏性能;相较原Park算法,相同信噪比下,改进序列的Park算法的频偏均方差(Mean Square Error,MSE)也小于原Park算法的频偏MSE,抗频偏性能表现更优。展开更多
A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power...A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power ratio(PAPR) of filter bank multicarrier-offset quadrature amplitude modulation(FBMC-OQAM) signals.The V subblocks in partial transmit sequence(PTS) are regrouped into U combinations according to the correlation coefficient p,and overlapping subblocks are allowed between adjacent groups.The search starts from the first group and sets the phase factors of the subsequent groups to 1.When the phase factors of the non-overlapping subblocks in the first group are determined,the subsequent groups are searched in turn to determine their respective phase factors.Starting from the second data block,the data overlapped with it should be taken into account when determining its optimal phase factor vector.Theoretical analysis and simulation results indicate that compared with the OPTS algorithm,the proposed algorithm can significantly reduce the computational complexity at the cost of slight deterioration of PAPR performance.Meanwhile,compared with the even-odd iterative double-layers OPTS(ID-OPTS) algorithm,it can further reduce the complexity and obtain a better PAPR suppression effect.展开更多
The multicarrier transmission techniques have been the most beguiling one for the development of wireless communication systems like 4G, Long Term evolution and now the successor 5G. For 5G or fifth generation wireles...The multicarrier transmission techniques have been the most beguiling one for the development of wireless communication systems like 4G, Long Term evolution and now the successor 5G. For 5G or fifth generation wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank Multi carrier modulation (FBMC) are the dominant waveform contenders. In this research paper, the disadvantages of OFDM have been addressed and it has shown that filter bank multicarrier (FBMC) could be a more effective solution. The comparative analysis of FBMC and OFDM has been performed based on Power Spectral Densities, sub channels, computational complexity and prototype filter comparison simulated using MATLAB.展开更多
滤波器组多载波技术(Filter Bank Multicarrier, FBMC)具有高峰均功率比(Peak-to-Average Power Ratio, PAPR)的问题,部分传输序列(Partial Transfer Sequence, PTS)是一种常用降低方法。提出一种基于多种群文化遗传算法(Multi-populati...滤波器组多载波技术(Filter Bank Multicarrier, FBMC)具有高峰均功率比(Peak-to-Average Power Ratio, PAPR)的问题,部分传输序列(Partial Transfer Sequence, PTS)是一种常用降低方法。提出一种基于多种群文化遗传算法(Multi-population Cultural Genetic Algorithm, MCGA)的改进分段PTS(Improved Segmental PTS,ISPTS)方法来降低PAPR。在传统分段PTS的方法基础上利用惩罚因子减少需要优化的段避免无效优化。利用MCGA进行相位因子搜索,减少了算法复杂度。仿真结果验证了该算法的优越性。展开更多
针对滤波器组多载波-偏移正交幅度调制技术(Filter Bank Multicarrier-Offset Quadrature Amplitude Modulation,FBMC-OQAM)存在峰均功率比(Peak-to-Average Power Ratio,PAPR)过高的问题,以及传统部分传输序列(Partial Transfer Sequen...针对滤波器组多载波-偏移正交幅度调制技术(Filter Bank Multicarrier-Offset Quadrature Amplitude Modulation,FBMC-OQAM)存在峰均功率比(Peak-to-Average Power Ratio,PAPR)过高的问题,以及传统部分传输序列(Partial Transfer Sequence,PTS)算法对PAPR抑制效果不明显,提出了一种新的基于自适应搜索策略的人工蜂群部分传输序列算法(Adaptive Search Strategy Based Artifical Bee Colony PTS,ASSABC-PTS)。首先,根据FBMC-OQAM系统特性,利用传统PTS算法对系统进行初步优化,以降低FBMC-OQAM系统的PAPR;然后,针对PTS算法中存在的计算复杂度问题,引入人工蜂群(Artificial Bee Colony,ABC)算法进行优化;最后,在ABC算法中引入自适应搜索策略提升算法的局部寻优能力,加快ABC算法的收敛速度和搜索精度。仿真实验表明,ASSABC-PTS在有效降低系统算法复杂度的同时,也极大降低了FBMC-OQAM系统的峰均功率比。展开更多
针对引入载波聚合的滤波器组多载波(carrier aggregation-filter bank multicarrier,CA-FBMC)调制系统峰均功率比(peak to average power ratio,PAPR)进一步升高的问题,基于预留子载波(tone reservation,TR)思想,提出一种适用于面向载...针对引入载波聚合的滤波器组多载波(carrier aggregation-filter bank multicarrier,CA-FBMC)调制系统峰均功率比(peak to average power ratio,PAPR)进一步升高的问题,基于预留子载波(tone reservation,TR)思想,提出一种适用于面向载波聚合的FBMC(filter bank multicarrier)系统降低PAPR的有效方法,利用分量载波间原有保护子载波充当预留子载波成分,结合时域信号剪切的处理方法,在不改变原有信号子载波有效输入数据的前提下,降低系统信号的PAPR。同时,由于重叠因子的存在,为克服系统符号重叠特性的影响,利用后向迭代的处理思想,对时域输出信号进行分组,针对每组信号分别进行迭代剪切处理,并将处理完成的信号进行后向叠加处理,从而避免符号重叠引发的峰值增生而导致PAPR回退的问题。仿真结果表明,该算法可在不影响系统基本传输性能的情况下有效降低系统的PAPR。展开更多
针对滤波器组多载波(FBMC:Filter Bank MultiCarrier)系统峰均比(PAPR:Peak to Average Power Ra-tion)较高的问题,基于FBMC系统中原型滤波器及其多项结构,借鉴正交频分复用(OFDM:Orthogonal Fre-quency Division Multiplexing)降低峰...针对滤波器组多载波(FBMC:Filter Bank MultiCarrier)系统峰均比(PAPR:Peak to Average Power Ra-tion)较高的问题,基于FBMC系统中原型滤波器及其多项结构,借鉴正交频分复用(OFDM:Orthogonal Fre-quency Division Multiplexing)降低峰均比方法,提出一种基于脉冲成型(PS:Pulse Shaping)技术的降低FB-MC系统峰均比的方法。该方法在综合滤波器S/P(Serial to Parallel)后添加频率加权,实现了时域的循环位移,从而达到降低峰均比的目的。仿真结果表明,在FBMC系统中引入PS技术后,峰均比有明显下降。展开更多
针对多径条件下,FBMC/OQAM系统采用分散式导频结构的信道估计算法存在导频功率开销过大的问题,提出一种基于双导频的功率优化信道估计算法(DDP with FFT)。在传统双导频信道估计(DDP)的基础上,主动引入相位模糊,降低传输导频对的功率消...针对多径条件下,FBMC/OQAM系统采用分散式导频结构的信道估计算法存在导频功率开销过大的问题,提出一种基于双导频的功率优化信道估计算法(DDP with FFT)。在传统双导频信道估计(DDP)的基础上,主动引入相位模糊,降低传输导频对的功率消耗,利用多径信道能量集中的特点,对引入的相位模糊进行估计,进一步保证信道估计准确度。理论分析和仿真结果表明,提出的优化算法可以有效降低导频功率开销,实现高精度信道估计性能。展开更多
针对面向载波聚合的滤波器组多载波(filter bank multicarrier,FBMC)系统中所存在的多频偏问题,提出一种适用于该系统的多频偏联合估计方法。根据FBMC系统符号重叠特性,每个分量载波上均采用训练序列构造周期性输出信号区间,依据多重信...针对面向载波聚合的滤波器组多载波(filter bank multicarrier,FBMC)系统中所存在的多频偏问题,提出一种适用于该系统的多频偏联合估计方法。根据FBMC系统符号重叠特性,每个分量载波上均采用训练序列构造周期性输出信号区间,依据多重信号特征分解理论,对输出信号区间协方差矩阵进行特征分解,通过构造频偏谱函数并进行峰值搜索得到多个频偏估计值,结合互相关函数完成多个频偏估计值分配过程。仿真结果表明,采用所提算法总体上可以将频偏估计的均方根误差控制在10-3左右。因此,该算法可以有效解决面向载波聚合的FBMC系统多频偏估计问题。展开更多
文摘部分传输序列(Partial Transmit Sequence,PTS)是降低正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统峰均比(Peak-to-Average Power Ratio,PAPR)的有效方法,但是PTS穷举法搜索最优解,使系统复杂度增加。针对这一缺点进行改进,提出了基于离散粒子群优化的部分传输序列(Partial Transmit Sequence based on Discrete Particle Swarm Optimization,PTS-DPSO)方法,并将其应用到基于偏移正交幅度调制的滤波器组多载波系统(Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation,FBMC/OQAM)中。PTS-DPSO利用离散粒子群优化搜寻最优解,避免了系统复杂度的增加。通过仿真验证,PTS-DPSO可以有效抑制FBMC/OQAM系统过高的PAPR且误码率低。
基金supported by the MOST Program of International S&T Cooperation(Grant No.2016YFE0123200)National Natural Science Foundation of China(Grant No.61471100/61101090/61571082)+1 种基金Science and Technology on Electronic Information Control Laboratory(Grant No.6142105040103)Fundamental Research Funds for the Central Universities(Grant No.ZYGX2015J012/ZYGX2014Z005)
文摘Compared to OFDM systems with cyclic prefi x, fi lterbank multicarrier with offset quadrature amplitude modulation(FBMC/OQAM) system is considered as an alternative technology for next generation wireless communication systems. However, FBMC systems suffer from intrinsic imaginary interference caused by the real-fi eld orthogonality destruction when passing through complex-valued fading channels. By analyzing the transmultiplexer's response of FBMC/OQAM systems, in this paper, a simple conjugated transmission scheme is proposed for FBMC/OQAM systems. Following the specific conjugation design, the intrinsic imaginary interference including the intrinsic inter-symbol and the inter-carrier interference can be eliminated at the receiver side through linear signal processing operation. Meanwhile, the proposed conjugated transmission scheme is able to obtain extra linear combination diversity gains for improving the systematic performance of FBMC/OQAM. Simulation results show that the proposed scheme is more efficient than conventional methods, especially in practical application scenarios with large Doppler spread caused by high-speed movement.
基金supported by ZTE Industry-Academia-Research Cooperation Funds under Grant No.Surrey-Ref-9953
文摘Filter-bank multicarrier （FBMC） with offset quadrature amplitude modulation （OQAM） is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing （OFDM） systems. However, because of or-thogonality in real field and the presence of imaginary intrinsic interference, channel estimation in FBMC is not as straightforward as OFDM systems especially in multiple antenna scenarios. In this paper, we propose a channel estimation method which employs intrinsic interference cancellation at the transmitter side. The simulation results show that this method has less pilot overhead, less peak to average power ratio （PAPR）, better bit error rate （BER）, and better mean square error （MSE） performance compared to the well-known intrinsic approximation methods （IAM）.
文摘为提高滤波器组多载波(Filter Bank Multicarrier,FBMC)系统在低信噪比下的定时同步准确率和抗频偏性能,基于FBMC系统与正交频分复用(Orthogonal Frequency Division Multiple,OFDM)系统的相似性,对OFDM系统定时同步中的Park测度函数进行改进并引入到FBMC系统中。利用共轭对称结构能够提高定时精度和加权处理能够更好地抵抗频偏影响的特点设计同步序列,进行共轭对称和加权处理。仿真结果表明,基于改进序列的Park算法相较共轭对称序列的TR1算法,其信噪比提前3 dB达到了100%定时准确率,实现了低信噪比下的高精度定时同步,且具有更强的抗频偏性能;相较原Park算法,相同信噪比下,改进序列的Park算法的频偏均方差(Mean Square Error,MSE)也小于原Park算法的频偏MSE,抗频偏性能表现更优。
基金Supported by the National Natural Science Foundation of China(No.61601296,61701295,61801286)the Major Scientific and Technological Innovation Projects in Chengdu(No.2019-YF08-00082-GX)the Talent Program of Shanghai University of Engineering Science(No.2018RC43)。
文摘A correlation overlapping partial transmit sequence(C-OPTS) algorithm is proposed to solve the issue of high complexity of overlapping partial transmit sequence(OPTS) algorithm in suppressing the peak to average power ratio(PAPR) of filter bank multicarrier-offset quadrature amplitude modulation(FBMC-OQAM) signals.The V subblocks in partial transmit sequence(PTS) are regrouped into U combinations according to the correlation coefficient p,and overlapping subblocks are allowed between adjacent groups.The search starts from the first group and sets the phase factors of the subsequent groups to 1.When the phase factors of the non-overlapping subblocks in the first group are determined,the subsequent groups are searched in turn to determine their respective phase factors.Starting from the second data block,the data overlapped with it should be taken into account when determining its optimal phase factor vector.Theoretical analysis and simulation results indicate that compared with the OPTS algorithm,the proposed algorithm can significantly reduce the computational complexity at the cost of slight deterioration of PAPR performance.Meanwhile,compared with the even-odd iterative double-layers OPTS(ID-OPTS) algorithm,it can further reduce the complexity and obtain a better PAPR suppression effect.
文摘The multicarrier transmission techniques have been the most beguiling one for the development of wireless communication systems like 4G, Long Term evolution and now the successor 5G. For 5G or fifth generation wireless communication, Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank Multi carrier modulation (FBMC) are the dominant waveform contenders. In this research paper, the disadvantages of OFDM have been addressed and it has shown that filter bank multicarrier (FBMC) could be a more effective solution. The comparative analysis of FBMC and OFDM has been performed based on Power Spectral Densities, sub channels, computational complexity and prototype filter comparison simulated using MATLAB.
文摘滤波器组多载波技术(Filter Bank Multicarrier, FBMC)具有高峰均功率比(Peak-to-Average Power Ratio, PAPR)的问题,部分传输序列(Partial Transfer Sequence, PTS)是一种常用降低方法。提出一种基于多种群文化遗传算法(Multi-population Cultural Genetic Algorithm, MCGA)的改进分段PTS(Improved Segmental PTS,ISPTS)方法来降低PAPR。在传统分段PTS的方法基础上利用惩罚因子减少需要优化的段避免无效优化。利用MCGA进行相位因子搜索,减少了算法复杂度。仿真结果验证了该算法的优越性。
文摘针对滤波器组多载波-偏移正交幅度调制技术(Filter Bank Multicarrier-Offset Quadrature Amplitude Modulation,FBMC-OQAM)存在峰均功率比(Peak-to-Average Power Ratio,PAPR)过高的问题,以及传统部分传输序列(Partial Transfer Sequence,PTS)算法对PAPR抑制效果不明显,提出了一种新的基于自适应搜索策略的人工蜂群部分传输序列算法(Adaptive Search Strategy Based Artifical Bee Colony PTS,ASSABC-PTS)。首先,根据FBMC-OQAM系统特性,利用传统PTS算法对系统进行初步优化,以降低FBMC-OQAM系统的PAPR;然后,针对PTS算法中存在的计算复杂度问题,引入人工蜂群(Artificial Bee Colony,ABC)算法进行优化;最后,在ABC算法中引入自适应搜索策略提升算法的局部寻优能力,加快ABC算法的收敛速度和搜索精度。仿真实验表明,ASSABC-PTS在有效降低系统算法复杂度的同时,也极大降低了FBMC-OQAM系统的峰均功率比。
基金The Scientific and Technological Research Program of Chongqing Municipal Education Commission(KJ1500435)
文摘针对引入载波聚合的滤波器组多载波(carrier aggregation-filter bank multicarrier,CA-FBMC)调制系统峰均功率比(peak to average power ratio,PAPR)进一步升高的问题,基于预留子载波(tone reservation,TR)思想,提出一种适用于面向载波聚合的FBMC(filter bank multicarrier)系统降低PAPR的有效方法,利用分量载波间原有保护子载波充当预留子载波成分,结合时域信号剪切的处理方法,在不改变原有信号子载波有效输入数据的前提下,降低系统信号的PAPR。同时,由于重叠因子的存在,为克服系统符号重叠特性的影响,利用后向迭代的处理思想,对时域输出信号进行分组,针对每组信号分别进行迭代剪切处理,并将处理完成的信号进行后向叠加处理,从而避免符号重叠引发的峰值增生而导致PAPR回退的问题。仿真结果表明,该算法可在不影响系统基本传输性能的情况下有效降低系统的PAPR。
文摘针对滤波器组多载波(FBMC:Filter Bank MultiCarrier)系统峰均比(PAPR:Peak to Average Power Ra-tion)较高的问题,基于FBMC系统中原型滤波器及其多项结构,借鉴正交频分复用(OFDM:Orthogonal Fre-quency Division Multiplexing)降低峰均比方法,提出一种基于脉冲成型(PS:Pulse Shaping)技术的降低FB-MC系统峰均比的方法。该方法在综合滤波器S/P(Serial to Parallel)后添加频率加权,实现了时域的循环位移,从而达到降低峰均比的目的。仿真结果表明,在FBMC系统中引入PS技术后,峰均比有明显下降。
文摘针对多径条件下,FBMC/OQAM系统采用分散式导频结构的信道估计算法存在导频功率开销过大的问题,提出一种基于双导频的功率优化信道估计算法(DDP with FFT)。在传统双导频信道估计(DDP)的基础上,主动引入相位模糊,降低传输导频对的功率消耗,利用多径信道能量集中的特点,对引入的相位模糊进行估计,进一步保证信道估计准确度。理论分析和仿真结果表明,提出的优化算法可以有效降低导频功率开销,实现高精度信道估计性能。
文摘针对面向载波聚合的滤波器组多载波(filter bank multicarrier,FBMC)系统中所存在的多频偏问题,提出一种适用于该系统的多频偏联合估计方法。根据FBMC系统符号重叠特性,每个分量载波上均采用训练序列构造周期性输出信号区间,依据多重信号特征分解理论,对输出信号区间协方差矩阵进行特征分解,通过构造频偏谱函数并进行峰值搜索得到多个频偏估计值,结合互相关函数完成多个频偏估计值分配过程。仿真结果表明,采用所提算法总体上可以将频偏估计的均方根误差控制在10-3左右。因此,该算法可以有效解决面向载波聚合的FBMC系统多频偏估计问题。
